CPU constantly at 100%

Hi, anyone got any experience of problems with the CPU running constantly at 100% (and consequently at too high a temperature)? I recently installed a new CD writer and it came with Nero Express software, I have since discovered that removal of the software gets rid of the problem (but I can't use the cd writer!) Any ideas?? I've posted this on the software/cooling boards in case I've chosen the wrong forum.
Thanks, Nick

Some software may not be compatible with your operating system. I have seen problems similar to this caused by CDRW software when a computer would always reboot after you shut down. You might look for a newer version of that program from the maker of the software on-line.